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Dimensional crossover of charge density wave and thermoelectric properties in CeTe_{2x}Sb_{x} single crystals, Applied Physics Letters (101) 143901 (2012)
Authors: Kyung Eun Lee, Byeong Hun Min, JongSoo Rhyee*, Jae Nyeong Kim, Ji Hoon Shim, and Yong Seung Kwon
Abstract
We have measured the electrical resistivity and Seebeck coefficient of CeTe2xSbx (x =0.0, 0.05, 0.1, 0.25, and 0.5) single crystals from 100K to 300K along the abplane, and we calculated their electronic structures and Fermi surfaces by using the density functional theory approach. The band structures of CeTe2 show the 2dimensional (2D) Fermi surface nesting behavior, which induce the charge density wave (CDW). In addition, there is a 3dimensional (3D) electron Fermi surface hindering the perfect CDW gap opening. By hole doping with the substitution of Sb at the Tesite, the 3Dlike Fermi surface disappears and the 2D perfect CDW gap opening enhances the power factor up to x=0.1. With further hole doping, the Fermi surfaces become 3dimensional structure with heavy hole bands. The enhancement of the power factor is observed near the dimensional crossover of CDW, at x=0.1, where the CDW gap is maximized. Here we show the strong relationship between the dimensionality of CDW and high thermoelectric power factor.


